General Information on Track Circuits - RGS Online

Railway Group Approved Code of Practice
GK/RC0752
Issue Two
Date December 1998
Page E4 of 52
Withdrawn Document
Uncontrolled When Printed
<strong>General</strong> <strong>Information</strong> on Track Circuits
b) Clip the pipe to the foot of the outside of flat bottom rail. On bull-head rail a
cab-lock round the pipe may be secured to the rail web with a taper pin.
These fixings prevent the pipe rotating or moving along its length and cutting
into the cable. The clip will still permit some sideways movement if the pipe is
struck.
c) Leave sufficient slack in the cable so that if the pipe does become detached
from the rail, the connection will not be pulled away. However, excessive
amounts of slack cable should be avoided in order to minimise the likelihood
of vandalism.
Orange pipe must not be cut along its length unless special dispensation has
been given.
Orange pipe must not be used in tunnels or other areas of restricted Ventilation.
If the pipe does ignite, it is difficult to extinguish and gives off heavy fumes.
Orange pipe is generally suitable as protection for crossing walkways if it is let
into the surface. When tail cables need to be protected for other reasons, such
as chemical spillage in sidings or for staff safety, a concrete route or under track
buried crossing should be used.
Catalogue numbers are given in clause E11.
E 4 R A I L T R A C K